2 * pNFS functions to call and manage layout drivers.
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
8 * Dean Hildebrand <dhildebz@umich.edu>
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_page.h>
32 #include <linux/module.h>
37 #define NFSDBG_FACILITY NFSDBG_PNFS
38 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
43 * protects pnfs_modules_tbl.
45 static DEFINE_SPINLOCK(pnfs_spinlock);
48 * pnfs_modules_tbl holds all pnfs modules
50 static LIST_HEAD(pnfs_modules_tbl);
52 /* Return the registered pnfs layout driver module matching given id */
53 static struct pnfs_layoutdriver_type *
54 find_pnfs_driver_locked(u32 id)
56 struct pnfs_layoutdriver_type *local;
58 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
63 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
67 static struct pnfs_layoutdriver_type *
68 find_pnfs_driver(u32 id)
70 struct pnfs_layoutdriver_type *local;
72 spin_lock(&pnfs_spinlock);
73 local = find_pnfs_driver_locked(id);
74 if (local != NULL && !try_module_get(local->owner)) {
75 dprintk("%s: Could not grab reference on module\n", __func__);
78 spin_unlock(&pnfs_spinlock);
83 unset_pnfs_layoutdriver(struct nfs_server *nfss)
85 if (nfss->pnfs_curr_ld) {
86 if (nfss->pnfs_curr_ld->clear_layoutdriver)
87 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
88 /* Decrement the MDS count. Purge the deviceid cache if zero */
89 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
90 nfs4_deviceid_purge_client(nfss->nfs_client);
91 module_put(nfss->pnfs_curr_ld->owner);
93 nfss->pnfs_curr_ld = NULL;
97 * Try to set the server's pnfs module to the pnfs layout type specified by id.
98 * Currently only one pNFS layout driver per filesystem is supported.
100 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
103 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
106 struct pnfs_layoutdriver_type *ld_type = NULL;
110 if (!(server->nfs_client->cl_exchange_flags &
111 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
112 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
113 __func__, id, server->nfs_client->cl_exchange_flags);
116 ld_type = find_pnfs_driver(id);
118 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
119 ld_type = find_pnfs_driver(id);
121 dprintk("%s: No pNFS module found for %u.\n",
126 server->pnfs_curr_ld = ld_type;
127 if (ld_type->set_layoutdriver
128 && ld_type->set_layoutdriver(server, mntfh)) {
129 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
130 "driver %u.\n", __func__, id);
131 module_put(ld_type->owner);
134 /* Bump the MDS count */
135 atomic_inc(&server->nfs_client->cl_mds_count);
137 dprintk("%s: pNFS module for %u set\n", __func__, id);
141 dprintk("%s: Using NFSv4 I/O\n", __func__);
142 server->pnfs_curr_ld = NULL;
146 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
148 int status = -EINVAL;
149 struct pnfs_layoutdriver_type *tmp;
151 if (ld_type->id == 0) {
152 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
155 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
156 printk(KERN_ERR "NFS: %s Layout driver must provide "
157 "alloc_lseg and free_lseg.\n", __func__);
161 spin_lock(&pnfs_spinlock);
162 tmp = find_pnfs_driver_locked(ld_type->id);
164 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
166 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
169 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
170 __func__, ld_type->id);
172 spin_unlock(&pnfs_spinlock);
176 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
179 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
181 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
182 spin_lock(&pnfs_spinlock);
183 list_del(&ld_type->pnfs_tblid);
184 spin_unlock(&pnfs_spinlock);
186 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
189 * pNFS client layout cache
192 /* Need to hold i_lock if caller does not already hold reference */
194 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
196 atomic_inc(&lo->plh_refcount);
199 static struct pnfs_layout_hdr *
200 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
202 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
203 return ld->alloc_layout_hdr(ino, gfp_flags);
207 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
209 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
210 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
212 if (!list_empty(&lo->plh_layouts)) {
213 struct nfs_client *clp = server->nfs_client;
215 spin_lock(&clp->cl_lock);
216 list_del_init(&lo->plh_layouts);
217 spin_unlock(&clp->cl_lock);
219 put_rpccred(lo->plh_lc_cred);
220 return ld->free_layout_hdr(lo);
224 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
226 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
227 dprintk("%s: freeing layout cache %p\n", __func__, lo);
229 /* Reset MDS Threshold I/O counters */
235 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
237 struct inode *inode = lo->plh_inode;
239 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
240 pnfs_detach_layout_hdr(lo);
241 spin_unlock(&inode->i_lock);
242 pnfs_free_layout_hdr(lo);
247 pnfs_iomode_to_fail_bit(u32 iomode)
249 return iomode == IOMODE_RW ?
250 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
254 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
256 lo->plh_retry_timestamp = jiffies;
257 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
258 atomic_inc(&lo->plh_refcount);
262 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
264 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
265 atomic_dec(&lo->plh_refcount);
269 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
271 struct inode *inode = lo->plh_inode;
272 struct pnfs_layout_range range = {
275 .length = NFS4_MAX_UINT64,
279 spin_lock(&inode->i_lock);
280 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
281 pnfs_mark_matching_lsegs_invalid(lo, &head, &range);
282 spin_unlock(&inode->i_lock);
283 pnfs_free_lseg_list(&head);
284 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
285 iomode == IOMODE_RW ? "RW" : "READ");
289 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
291 unsigned long start, end;
292 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
294 if (test_bit(fail_bit, &lo->plh_flags) == 0)
297 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
298 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
299 /* It is time to retry the failed layoutgets */
300 pnfs_layout_clear_fail_bit(lo, fail_bit);
307 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
309 INIT_LIST_HEAD(&lseg->pls_list);
310 INIT_LIST_HEAD(&lseg->pls_lc_list);
311 atomic_set(&lseg->pls_refcount, 1);
313 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
314 lseg->pls_layout = lo;
317 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
319 struct inode *ino = lseg->pls_layout->plh_inode;
321 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
325 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
326 struct pnfs_layout_segment *lseg)
328 struct inode *inode = lo->plh_inode;
330 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
331 list_del_init(&lseg->pls_list);
332 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
333 atomic_dec(&lo->plh_refcount);
334 if (list_empty(&lo->plh_segs))
335 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
336 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
340 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
342 struct pnfs_layout_hdr *lo;
348 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
349 atomic_read(&lseg->pls_refcount),
350 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
351 lo = lseg->pls_layout;
352 inode = lo->plh_inode;
353 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
354 pnfs_get_layout_hdr(lo);
355 pnfs_layout_remove_lseg(lo, lseg);
356 spin_unlock(&inode->i_lock);
357 pnfs_free_lseg(lseg);
358 pnfs_put_layout_hdr(lo);
361 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
364 end_offset(u64 start, u64 len)
369 return end >= start ? end : NFS4_MAX_UINT64;
373 * is l2 fully contained in l1?
375 * [----------------------------------)
380 lo_seg_contained(struct pnfs_layout_range *l1,
381 struct pnfs_layout_range *l2)
383 u64 start1 = l1->offset;
384 u64 end1 = end_offset(start1, l1->length);
385 u64 start2 = l2->offset;
386 u64 end2 = end_offset(start2, l2->length);
388 return (start1 <= start2) && (end1 >= end2);
392 * is l1 and l2 intersecting?
394 * [----------------------------------)
399 lo_seg_intersecting(struct pnfs_layout_range *l1,
400 struct pnfs_layout_range *l2)
402 u64 start1 = l1->offset;
403 u64 end1 = end_offset(start1, l1->length);
404 u64 start2 = l2->offset;
405 u64 end2 = end_offset(start2, l2->length);
407 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
408 (end2 == NFS4_MAX_UINT64 || end2 > start1);
412 should_free_lseg(struct pnfs_layout_range *lseg_range,
413 struct pnfs_layout_range *recall_range)
415 return (recall_range->iomode == IOMODE_ANY ||
416 lseg_range->iomode == recall_range->iomode) &&
417 lo_seg_intersecting(lseg_range, recall_range);
420 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
421 struct list_head *tmp_list)
423 if (!atomic_dec_and_test(&lseg->pls_refcount))
425 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
426 list_add(&lseg->pls_list, tmp_list);
430 /* Returns 1 if lseg is removed from list, 0 otherwise */
431 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
432 struct list_head *tmp_list)
436 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
437 /* Remove the reference keeping the lseg in the
438 * list. It will now be removed when all
439 * outstanding io is finished.
441 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
442 atomic_read(&lseg->pls_refcount));
443 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
449 /* Returns count of number of matching invalid lsegs remaining in list
453 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
454 struct list_head *tmp_list,
455 struct pnfs_layout_range *recall_range)
457 struct pnfs_layout_segment *lseg, *next;
458 int invalid = 0, removed = 0;
460 dprintk("%s:Begin lo %p\n", __func__, lo);
462 if (list_empty(&lo->plh_segs))
464 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
466 should_free_lseg(&lseg->pls_range, recall_range)) {
467 dprintk("%s: freeing lseg %p iomode %d "
468 "offset %llu length %llu\n", __func__,
469 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
470 lseg->pls_range.length);
472 removed += mark_lseg_invalid(lseg, tmp_list);
474 dprintk("%s:Return %i\n", __func__, invalid - removed);
475 return invalid - removed;
478 /* note free_me must contain lsegs from a single layout_hdr */
480 pnfs_free_lseg_list(struct list_head *free_me)
482 struct pnfs_layout_segment *lseg, *tmp;
484 if (list_empty(free_me))
487 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
488 list_del(&lseg->pls_list);
489 pnfs_free_lseg(lseg);
494 pnfs_destroy_layout(struct nfs_inode *nfsi)
496 struct pnfs_layout_hdr *lo;
499 spin_lock(&nfsi->vfs_inode.i_lock);
502 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
503 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
504 pnfs_get_layout_hdr(lo);
505 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
506 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
507 spin_unlock(&nfsi->vfs_inode.i_lock);
508 pnfs_free_lseg_list(&tmp_list);
509 pnfs_put_layout_hdr(lo);
511 spin_unlock(&nfsi->vfs_inode.i_lock);
513 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
516 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
517 struct list_head *layout_list)
519 struct pnfs_layout_hdr *lo;
522 spin_lock(&inode->i_lock);
523 lo = NFS_I(inode)->layout;
524 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
525 pnfs_get_layout_hdr(lo);
526 list_add(&lo->plh_bulk_destroy, layout_list);
529 spin_unlock(&inode->i_lock);
533 /* Caller must hold rcu_read_lock and clp->cl_lock */
535 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
536 struct nfs_server *server,
537 struct list_head *layout_list)
539 struct pnfs_layout_hdr *lo, *next;
542 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
543 inode = igrab(lo->plh_inode);
546 list_del_init(&lo->plh_layouts);
547 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
550 spin_unlock(&clp->cl_lock);
552 spin_lock(&clp->cl_lock);
560 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
563 struct pnfs_layout_hdr *lo;
565 struct pnfs_layout_range range = {
566 .iomode = IOMODE_ANY,
568 .length = NFS4_MAX_UINT64,
570 LIST_HEAD(lseg_list);
573 while (!list_empty(layout_list)) {
574 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
576 dprintk("%s freeing layout for inode %lu\n", __func__,
577 lo->plh_inode->i_ino);
578 inode = lo->plh_inode;
579 spin_lock(&inode->i_lock);
580 list_del_init(&lo->plh_bulk_destroy);
581 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
583 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
584 if (pnfs_mark_matching_lsegs_invalid(lo, &lseg_list, &range))
586 spin_unlock(&inode->i_lock);
587 pnfs_free_lseg_list(&lseg_list);
588 pnfs_put_layout_hdr(lo);
595 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
596 struct nfs_fsid *fsid,
599 struct nfs_server *server;
600 LIST_HEAD(layout_list);
602 spin_lock(&clp->cl_lock);
605 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
606 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
608 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
614 spin_unlock(&clp->cl_lock);
616 if (list_empty(&layout_list))
618 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
622 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
625 struct nfs_server *server;
626 LIST_HEAD(layout_list);
628 spin_lock(&clp->cl_lock);
631 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
632 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
638 spin_unlock(&clp->cl_lock);
640 if (list_empty(&layout_list))
642 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
646 * Called by the state manger to remove all layouts established under an
650 pnfs_destroy_all_layouts(struct nfs_client *clp)
652 nfs4_deviceid_mark_client_invalid(clp);
653 nfs4_deviceid_purge_client(clp);
655 pnfs_destroy_layouts_byclid(clp, false);
659 * Compare 2 layout stateid sequence ids, to see which is newer,
660 * taking into account wraparound issues.
662 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
664 return (s32)s1 - (s32)s2 > 0;
667 /* update lo->plh_stateid with new if is more recent */
669 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
672 u32 oldseq, newseq, new_barrier;
673 int empty = list_empty(&lo->plh_segs);
675 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
676 newseq = be32_to_cpu(new->seqid);
677 if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
678 nfs4_stateid_copy(&lo->plh_stateid, new);
679 if (update_barrier) {
680 new_barrier = be32_to_cpu(new->seqid);
682 /* Because of wraparound, we want to keep the barrier
683 * "close" to the current seqids.
685 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
687 if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
688 lo->plh_barrier = new_barrier;
693 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
694 const nfs4_stateid *stateid)
696 u32 seqid = be32_to_cpu(stateid->seqid);
698 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
701 /* lget is set to 1 if called from inside send_layoutget call chain */
703 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo, int lget)
705 return lo->plh_block_lgets ||
706 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
707 (list_empty(&lo->plh_segs) &&
708 (atomic_read(&lo->plh_outstanding) > lget));
712 pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
713 struct nfs4_state *open_state)
717 dprintk("--> %s\n", __func__);
718 spin_lock(&lo->plh_inode->i_lock);
719 if (pnfs_layoutgets_blocked(lo, 1)) {
721 } else if (!nfs4_valid_open_stateid(open_state)) {
723 } else if (list_empty(&lo->plh_segs)) {
727 seq = read_seqbegin(&open_state->seqlock);
728 nfs4_stateid_copy(dst, &open_state->stateid);
729 } while (read_seqretry(&open_state->seqlock, seq));
731 nfs4_stateid_copy(dst, &lo->plh_stateid);
732 spin_unlock(&lo->plh_inode->i_lock);
733 dprintk("<-- %s\n", __func__);
738 * Get layout from server.
739 * for now, assume that whole file layouts are requested.
741 * arg->length: all ones
743 static struct pnfs_layout_segment *
744 send_layoutget(struct pnfs_layout_hdr *lo,
745 struct nfs_open_context *ctx,
746 struct pnfs_layout_range *range,
749 struct inode *ino = lo->plh_inode;
750 struct nfs_server *server = NFS_SERVER(ino);
751 struct nfs4_layoutget *lgp;
752 struct pnfs_layout_segment *lseg;
754 dprintk("--> %s\n", __func__);
756 lgp = kzalloc(sizeof(*lgp), gfp_flags);
760 lgp->args.minlength = PAGE_CACHE_SIZE;
761 if (lgp->args.minlength > range->length)
762 lgp->args.minlength = range->length;
763 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
764 lgp->args.range = *range;
765 lgp->args.type = server->pnfs_curr_ld->id;
766 lgp->args.inode = ino;
767 lgp->args.ctx = get_nfs_open_context(ctx);
768 lgp->gfp_flags = gfp_flags;
769 lgp->cred = lo->plh_lc_cred;
771 /* Synchronously retrieve layout information from server and
774 lseg = nfs4_proc_layoutget(lgp, gfp_flags);
776 switch (PTR_ERR(lseg)) {
781 /* remember that LAYOUTGET failed and suspend trying */
782 pnfs_layout_io_set_failed(lo, range->iomode);
790 static void pnfs_clear_layoutcommit(struct inode *inode,
791 struct list_head *head)
793 struct nfs_inode *nfsi = NFS_I(inode);
794 struct pnfs_layout_segment *lseg, *tmp;
796 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
798 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
799 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
801 pnfs_lseg_dec_and_remove_zero(lseg, head);
806 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
807 * when the layout segment list is empty.
809 * Note that a pnfs_layout_hdr can exist with an empty layout segment
810 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
811 * deviceid is marked invalid.
814 _pnfs_return_layout(struct inode *ino)
816 struct pnfs_layout_hdr *lo = NULL;
817 struct nfs_inode *nfsi = NFS_I(ino);
819 struct nfs4_layoutreturn *lrp;
820 nfs4_stateid stateid;
821 int status = 0, empty;
823 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
825 spin_lock(&ino->i_lock);
828 spin_unlock(&ino->i_lock);
829 dprintk("NFS: %s no layout to return\n", __func__);
832 stateid = nfsi->layout->plh_stateid;
833 /* Reference matched in nfs4_layoutreturn_release */
834 pnfs_get_layout_hdr(lo);
835 empty = list_empty(&lo->plh_segs);
836 pnfs_clear_layoutcommit(ino, &tmp_list);
837 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
838 /* Don't send a LAYOUTRETURN if list was initially empty */
840 spin_unlock(&ino->i_lock);
841 pnfs_put_layout_hdr(lo);
842 dprintk("NFS: %s no layout segments to return\n", __func__);
845 lo->plh_block_lgets++;
846 spin_unlock(&ino->i_lock);
847 pnfs_free_lseg_list(&tmp_list);
849 lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);
850 if (unlikely(lrp == NULL)) {
852 spin_lock(&ino->i_lock);
853 lo->plh_block_lgets--;
854 spin_unlock(&ino->i_lock);
855 pnfs_put_layout_hdr(lo);
859 lrp->args.stateid = stateid;
860 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
861 lrp->args.inode = ino;
862 lrp->args.layout = lo;
863 lrp->clp = NFS_SERVER(ino)->nfs_client;
865 status = nfs4_proc_layoutreturn(lrp);
867 dprintk("<-- %s status: %d\n", __func__, status);
870 EXPORT_SYMBOL_GPL(_pnfs_return_layout);
873 pnfs_commit_and_return_layout(struct inode *inode)
875 struct pnfs_layout_hdr *lo;
878 spin_lock(&inode->i_lock);
879 lo = NFS_I(inode)->layout;
881 spin_unlock(&inode->i_lock);
884 pnfs_get_layout_hdr(lo);
885 /* Block new layoutgets and read/write to ds */
886 lo->plh_block_lgets++;
887 spin_unlock(&inode->i_lock);
888 filemap_fdatawait(inode->i_mapping);
889 ret = pnfs_layoutcommit_inode(inode, true);
891 ret = _pnfs_return_layout(inode);
892 spin_lock(&inode->i_lock);
893 lo->plh_block_lgets--;
894 spin_unlock(&inode->i_lock);
895 pnfs_put_layout_hdr(lo);
899 bool pnfs_roc(struct inode *ino)
901 struct pnfs_layout_hdr *lo;
902 struct pnfs_layout_segment *lseg, *tmp;
906 spin_lock(&ino->i_lock);
907 lo = NFS_I(ino)->layout;
908 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
909 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
911 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
912 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
913 mark_lseg_invalid(lseg, &tmp_list);
918 lo->plh_block_lgets++;
919 pnfs_get_layout_hdr(lo); /* matched in pnfs_roc_release */
920 spin_unlock(&ino->i_lock);
921 pnfs_free_lseg_list(&tmp_list);
925 spin_unlock(&ino->i_lock);
929 void pnfs_roc_release(struct inode *ino)
931 struct pnfs_layout_hdr *lo;
933 spin_lock(&ino->i_lock);
934 lo = NFS_I(ino)->layout;
935 lo->plh_block_lgets--;
936 if (atomic_dec_and_test(&lo->plh_refcount)) {
937 pnfs_detach_layout_hdr(lo);
938 spin_unlock(&ino->i_lock);
939 pnfs_free_layout_hdr(lo);
941 spin_unlock(&ino->i_lock);
944 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
946 struct pnfs_layout_hdr *lo;
948 spin_lock(&ino->i_lock);
949 lo = NFS_I(ino)->layout;
950 if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
951 lo->plh_barrier = barrier;
952 spin_unlock(&ino->i_lock);
955 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
957 struct nfs_inode *nfsi = NFS_I(ino);
958 struct pnfs_layout_hdr *lo;
959 struct pnfs_layout_segment *lseg;
963 spin_lock(&ino->i_lock);
964 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
965 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
966 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
971 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
973 /* Since close does not return a layout stateid for use as
974 * a barrier, we choose the worst-case barrier.
976 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
978 spin_unlock(&ino->i_lock);
983 * Compare two layout segments for sorting into layout cache.
984 * We want to preferentially return RW over RO layouts, so ensure those
988 cmp_layout(struct pnfs_layout_range *l1,
989 struct pnfs_layout_range *l2)
993 /* high offset > low offset */
994 d = l1->offset - l2->offset;
998 /* short length > long length */
999 d = l2->length - l1->length;
1003 /* read > read/write */
1004 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1008 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1009 struct pnfs_layout_segment *lseg)
1011 struct pnfs_layout_segment *lp;
1013 dprintk("%s:Begin\n", __func__);
1015 list_for_each_entry(lp, &lo->plh_segs, pls_list) {
1016 if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0)
1018 list_add_tail(&lseg->pls_list, &lp->pls_list);
1019 dprintk("%s: inserted lseg %p "
1020 "iomode %d offset %llu length %llu before "
1021 "lp %p iomode %d offset %llu length %llu\n",
1022 __func__, lseg, lseg->pls_range.iomode,
1023 lseg->pls_range.offset, lseg->pls_range.length,
1024 lp, lp->pls_range.iomode, lp->pls_range.offset,
1025 lp->pls_range.length);
1028 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1029 dprintk("%s: inserted lseg %p "
1030 "iomode %d offset %llu length %llu at tail\n",
1031 __func__, lseg, lseg->pls_range.iomode,
1032 lseg->pls_range.offset, lseg->pls_range.length);
1034 pnfs_get_layout_hdr(lo);
1036 dprintk("%s:Return\n", __func__);
1039 static struct pnfs_layout_hdr *
1040 alloc_init_layout_hdr(struct inode *ino,
1041 struct nfs_open_context *ctx,
1044 struct pnfs_layout_hdr *lo;
1046 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1049 atomic_set(&lo->plh_refcount, 1);
1050 INIT_LIST_HEAD(&lo->plh_layouts);
1051 INIT_LIST_HEAD(&lo->plh_segs);
1052 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1053 lo->plh_inode = ino;
1054 lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred);
1058 static struct pnfs_layout_hdr *
1059 pnfs_find_alloc_layout(struct inode *ino,
1060 struct nfs_open_context *ctx,
1063 struct nfs_inode *nfsi = NFS_I(ino);
1064 struct pnfs_layout_hdr *new = NULL;
1066 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1068 if (nfsi->layout != NULL)
1070 spin_unlock(&ino->i_lock);
1071 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1072 spin_lock(&ino->i_lock);
1074 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1077 } else if (new != NULL)
1078 pnfs_free_layout_hdr(new);
1080 pnfs_get_layout_hdr(nfsi->layout);
1081 return nfsi->layout;
1085 * iomode matching rules:
1096 is_matching_lseg(struct pnfs_layout_range *ls_range,
1097 struct pnfs_layout_range *range)
1099 struct pnfs_layout_range range1;
1101 if ((range->iomode == IOMODE_RW &&
1102 ls_range->iomode != IOMODE_RW) ||
1103 !lo_seg_intersecting(ls_range, range))
1106 /* range1 covers only the first byte in the range */
1109 return lo_seg_contained(ls_range, &range1);
1113 * lookup range in layout
1115 static struct pnfs_layout_segment *
1116 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1117 struct pnfs_layout_range *range)
1119 struct pnfs_layout_segment *lseg, *ret = NULL;
1121 dprintk("%s:Begin\n", __func__);
1123 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1124 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1125 is_matching_lseg(&lseg->pls_range, range)) {
1126 ret = pnfs_get_lseg(lseg);
1129 if (lseg->pls_range.offset > range->offset)
1133 dprintk("%s:Return lseg %p ref %d\n",
1134 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1139 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1140 * to the MDS or over pNFS
1142 * The nfs_inode read_io and write_io fields are cumulative counters reset
1143 * when there are no layout segments. Note that in pnfs_update_layout iomode
1144 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1147 * A return of true means use MDS I/O.
1150 * If a file's size is smaller than the file size threshold, data accesses
1151 * SHOULD be sent to the metadata server. If an I/O request has a length that
1152 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1153 * server. If both file size and I/O size are provided, the client SHOULD
1154 * reach or exceed both thresholds before sending its read or write
1155 * requests to the data server.
1157 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1158 struct inode *ino, int iomode)
1160 struct nfs4_threshold *t = ctx->mdsthreshold;
1161 struct nfs_inode *nfsi = NFS_I(ino);
1162 loff_t fsize = i_size_read(ino);
1163 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1168 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1169 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1173 if (t->bm & THRESHOLD_RD) {
1174 dprintk("%s fsize %llu\n", __func__, fsize);
1176 if (fsize < t->rd_sz)
1179 if (t->bm & THRESHOLD_RD_IO) {
1180 dprintk("%s nfsi->read_io %llu\n", __func__,
1183 if (nfsi->read_io < t->rd_io_sz)
1188 if (t->bm & THRESHOLD_WR) {
1189 dprintk("%s fsize %llu\n", __func__, fsize);
1191 if (fsize < t->wr_sz)
1194 if (t->bm & THRESHOLD_WR_IO) {
1195 dprintk("%s nfsi->write_io %llu\n", __func__,
1198 if (nfsi->write_io < t->wr_io_sz)
1203 if (size_set && io_set) {
1206 } else if (size || io)
1209 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1214 * Layout segment is retreived from the server if not cached.
1215 * The appropriate layout segment is referenced and returned to the caller.
1217 struct pnfs_layout_segment *
1218 pnfs_update_layout(struct inode *ino,
1219 struct nfs_open_context *ctx,
1222 enum pnfs_iomode iomode,
1225 struct pnfs_layout_range arg = {
1231 struct nfs_server *server = NFS_SERVER(ino);
1232 struct nfs_client *clp = server->nfs_client;
1233 struct pnfs_layout_hdr *lo;
1234 struct pnfs_layout_segment *lseg = NULL;
1237 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
1240 if (pnfs_within_mdsthreshold(ctx, ino, iomode))
1243 spin_lock(&ino->i_lock);
1244 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1246 spin_unlock(&ino->i_lock);
1250 /* Do we even need to bother with this? */
1251 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1252 dprintk("%s matches recall, use MDS\n", __func__);
1256 /* if LAYOUTGET already failed once we don't try again */
1257 if (pnfs_layout_io_test_failed(lo, iomode))
1260 /* Check to see if the layout for the given range already exists */
1261 lseg = pnfs_find_lseg(lo, &arg);
1265 if (pnfs_layoutgets_blocked(lo, 0))
1267 atomic_inc(&lo->plh_outstanding);
1269 first = list_empty(&lo->plh_layouts) ? true : false;
1270 spin_unlock(&ino->i_lock);
1273 /* The lo must be on the clp list if there is any
1274 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1276 spin_lock(&clp->cl_lock);
1277 list_add_tail(&lo->plh_layouts, &server->layouts);
1278 spin_unlock(&clp->cl_lock);
1281 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1283 arg.offset -= pg_offset;
1284 arg.length += pg_offset;
1286 if (arg.length != NFS4_MAX_UINT64)
1287 arg.length = PAGE_CACHE_ALIGN(arg.length);
1289 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1290 atomic_dec(&lo->plh_outstanding);
1292 pnfs_put_layout_hdr(lo);
1294 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1295 "(%s, offset: %llu, length: %llu)\n",
1296 __func__, ino->i_sb->s_id,
1297 (unsigned long long)NFS_FILEID(ino),
1298 lseg == NULL ? "not found" : "found",
1299 iomode==IOMODE_RW ? "read/write" : "read-only",
1300 (unsigned long long)pos,
1301 (unsigned long long)count);
1304 spin_unlock(&ino->i_lock);
1305 goto out_put_layout_hdr;
1307 EXPORT_SYMBOL_GPL(pnfs_update_layout);
1309 struct pnfs_layout_segment *
1310 pnfs_layout_process(struct nfs4_layoutget *lgp)
1312 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1313 struct nfs4_layoutget_res *res = &lgp->res;
1314 struct pnfs_layout_segment *lseg;
1315 struct inode *ino = lo->plh_inode;
1318 /* Inject layout blob into I/O device driver */
1319 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1320 if (!lseg || IS_ERR(lseg)) {
1324 status = PTR_ERR(lseg);
1325 dprintk("%s: Could not allocate layout: error %d\n",
1330 spin_lock(&ino->i_lock);
1331 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1332 dprintk("%s forget reply due to recall\n", __func__);
1333 goto out_forget_reply;
1336 if (pnfs_layoutgets_blocked(lo, 1) ||
1337 pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1338 dprintk("%s forget reply due to state\n", __func__);
1339 goto out_forget_reply;
1342 /* Done processing layoutget. Set the layout stateid */
1343 pnfs_set_layout_stateid(lo, &res->stateid, false);
1345 init_lseg(lo, lseg);
1346 lseg->pls_range = res->range;
1347 pnfs_get_lseg(lseg);
1348 pnfs_layout_insert_lseg(lo, lseg);
1350 if (res->return_on_close) {
1351 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1352 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
1355 spin_unlock(&ino->i_lock);
1358 return ERR_PTR(status);
1361 spin_unlock(&ino->i_lock);
1362 lseg->pls_layout = lo;
1363 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1368 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1370 u64 rd_size = req->wb_bytes;
1372 WARN_ON_ONCE(pgio->pg_lseg != NULL);
1374 if (req->wb_offset != req->wb_pgbase) {
1375 nfs_pageio_reset_read_mds(pgio);
1379 if (pgio->pg_dreq == NULL)
1380 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
1382 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
1384 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1390 /* If no lseg, fall back to read through mds */
1391 if (pgio->pg_lseg == NULL)
1392 nfs_pageio_reset_read_mds(pgio);
1395 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1398 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
1399 struct nfs_page *req, u64 wb_size)
1401 WARN_ON_ONCE(pgio->pg_lseg != NULL);
1403 if (req->wb_offset != req->wb_pgbase) {
1404 nfs_pageio_reset_write_mds(pgio);
1408 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1414 /* If no lseg, fall back to write through mds */
1415 if (pgio->pg_lseg == NULL)
1416 nfs_pageio_reset_write_mds(pgio);
1418 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1421 pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
1422 const struct nfs_pgio_completion_ops *compl_ops)
1424 struct nfs_server *server = NFS_SERVER(inode);
1425 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1428 nfs_pageio_init_read(pgio, inode, compl_ops);
1430 nfs_pageio_init(pgio, inode, ld->pg_read_ops, compl_ops, server->rsize, 0);
1434 pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode,
1436 const struct nfs_pgio_completion_ops *compl_ops)
1438 struct nfs_server *server = NFS_SERVER(inode);
1439 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1442 nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
1444 nfs_pageio_init(pgio, inode, ld->pg_write_ops, compl_ops, server->wsize, ioflags);
1448 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
1449 struct nfs_page *req)
1451 if (pgio->pg_lseg == NULL)
1452 return nfs_generic_pg_test(pgio, prev, req);
1455 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1456 * Note that this test makes several assumptions:
1457 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1458 * is known to lie within the range.
1459 * - that the nfs_page being tested is known to be contiguous with the
1460 * previous nfs_page.
1461 * - Layout ranges are page aligned, so we only have to test the
1462 * start offset of the request.
1464 * Please also note that 'end_offset' is actually the offset of the
1465 * first byte that lies outside the pnfs_layout_range. FIXME?
1468 return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset,
1469 pgio->pg_lseg->pls_range.length);
1471 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1473 int pnfs_write_done_resend_to_mds(struct inode *inode,
1474 struct list_head *head,
1475 const struct nfs_pgio_completion_ops *compl_ops,
1476 struct nfs_direct_req *dreq)
1478 struct nfs_pageio_descriptor pgio;
1481 /* Resend all requests through the MDS */
1482 nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, compl_ops);
1483 pgio.pg_dreq = dreq;
1484 while (!list_empty(head)) {
1485 struct nfs_page *req = nfs_list_entry(head->next);
1487 nfs_list_remove_request(req);
1488 if (!nfs_pageio_add_request(&pgio, req))
1489 nfs_list_add_request(req, &failed);
1491 nfs_pageio_complete(&pgio);
1493 if (!list_empty(&failed)) {
1494 /* For some reason our attempt to resend pages. Mark the
1495 * overall send request as having failed, and let
1496 * nfs_writeback_release_full deal with the error.
1498 list_move(&failed, head);
1503 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1505 static void pnfs_ld_handle_write_error(struct nfs_write_data *data)
1507 struct nfs_pgio_header *hdr = data->header;
1509 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
1510 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1511 PNFS_LAYOUTRET_ON_ERROR) {
1512 pnfs_return_layout(hdr->inode);
1514 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1515 data->task.tk_status = pnfs_write_done_resend_to_mds(hdr->inode,
1517 hdr->completion_ops,
1522 * Called by non rpc-based layout drivers
1524 void pnfs_ld_write_done(struct nfs_write_data *data)
1526 struct nfs_pgio_header *hdr = data->header;
1528 if (!hdr->pnfs_error) {
1529 pnfs_set_layoutcommit(data);
1530 hdr->mds_ops->rpc_call_done(&data->task, data);
1532 pnfs_ld_handle_write_error(data);
1533 hdr->mds_ops->rpc_release(data);
1535 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1538 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1539 struct nfs_write_data *data)
1541 struct nfs_pgio_header *hdr = data->header;
1543 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1544 list_splice_tail_init(&hdr->pages, &desc->pg_list);
1545 nfs_pageio_reset_write_mds(desc);
1546 desc->pg_recoalesce = 1;
1548 nfs_writedata_release(data);
1551 static enum pnfs_try_status
1552 pnfs_try_to_write_data(struct nfs_write_data *wdata,
1553 const struct rpc_call_ops *call_ops,
1554 struct pnfs_layout_segment *lseg,
1557 struct nfs_pgio_header *hdr = wdata->header;
1558 struct inode *inode = hdr->inode;
1559 enum pnfs_try_status trypnfs;
1560 struct nfs_server *nfss = NFS_SERVER(inode);
1562 hdr->mds_ops = call_ops;
1564 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1565 inode->i_ino, wdata->args.count, wdata->args.offset, how);
1566 trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
1567 if (trypnfs != PNFS_NOT_ATTEMPTED)
1568 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1569 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1574 pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how)
1576 struct nfs_write_data *data;
1577 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1578 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1580 desc->pg_lseg = NULL;
1581 while (!list_empty(head)) {
1582 enum pnfs_try_status trypnfs;
1584 data = list_first_entry(head, struct nfs_write_data, list);
1585 list_del_init(&data->list);
1587 trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how);
1588 if (trypnfs == PNFS_NOT_ATTEMPTED)
1589 pnfs_write_through_mds(desc, data);
1591 pnfs_put_lseg(lseg);
1594 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
1596 pnfs_put_lseg(hdr->lseg);
1597 nfs_writehdr_free(hdr);
1599 EXPORT_SYMBOL_GPL(pnfs_writehdr_free);
1602 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1604 struct nfs_write_header *whdr;
1605 struct nfs_pgio_header *hdr;
1608 whdr = nfs_writehdr_alloc();
1610 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1611 pnfs_put_lseg(desc->pg_lseg);
1612 desc->pg_lseg = NULL;
1615 hdr = &whdr->header;
1616 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
1617 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
1618 atomic_inc(&hdr->refcnt);
1619 ret = nfs_generic_flush(desc, hdr);
1621 pnfs_put_lseg(desc->pg_lseg);
1622 desc->pg_lseg = NULL;
1624 pnfs_do_multiple_writes(desc, &hdr->rpc_list, desc->pg_ioflags);
1625 if (atomic_dec_and_test(&hdr->refcnt))
1626 hdr->completion_ops->completion(hdr);
1629 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
1631 int pnfs_read_done_resend_to_mds(struct inode *inode,
1632 struct list_head *head,
1633 const struct nfs_pgio_completion_ops *compl_ops,
1634 struct nfs_direct_req *dreq)
1636 struct nfs_pageio_descriptor pgio;
1639 /* Resend all requests through the MDS */
1640 nfs_pageio_init_read(&pgio, inode, compl_ops);
1641 pgio.pg_dreq = dreq;
1642 while (!list_empty(head)) {
1643 struct nfs_page *req = nfs_list_entry(head->next);
1645 nfs_list_remove_request(req);
1646 if (!nfs_pageio_add_request(&pgio, req))
1647 nfs_list_add_request(req, &failed);
1649 nfs_pageio_complete(&pgio);
1651 if (!list_empty(&failed)) {
1652 list_move(&failed, head);
1657 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
1659 static void pnfs_ld_handle_read_error(struct nfs_read_data *data)
1661 struct nfs_pgio_header *hdr = data->header;
1663 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
1664 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1665 PNFS_LAYOUTRET_ON_ERROR) {
1666 pnfs_return_layout(hdr->inode);
1668 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1669 data->task.tk_status = pnfs_read_done_resend_to_mds(hdr->inode,
1671 hdr->completion_ops,
1676 * Called by non rpc-based layout drivers
1678 void pnfs_ld_read_done(struct nfs_read_data *data)
1680 struct nfs_pgio_header *hdr = data->header;
1682 if (likely(!hdr->pnfs_error)) {
1683 __nfs4_read_done_cb(data);
1684 hdr->mds_ops->rpc_call_done(&data->task, data);
1686 pnfs_ld_handle_read_error(data);
1687 hdr->mds_ops->rpc_release(data);
1689 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
1692 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
1693 struct nfs_read_data *data)
1695 struct nfs_pgio_header *hdr = data->header;
1697 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1698 list_splice_tail_init(&hdr->pages, &desc->pg_list);
1699 nfs_pageio_reset_read_mds(desc);
1700 desc->pg_recoalesce = 1;
1702 nfs_readdata_release(data);
1706 * Call the appropriate parallel I/O subsystem read function.
1708 static enum pnfs_try_status
1709 pnfs_try_to_read_data(struct nfs_read_data *rdata,
1710 const struct rpc_call_ops *call_ops,
1711 struct pnfs_layout_segment *lseg)
1713 struct nfs_pgio_header *hdr = rdata->header;
1714 struct inode *inode = hdr->inode;
1715 struct nfs_server *nfss = NFS_SERVER(inode);
1716 enum pnfs_try_status trypnfs;
1718 hdr->mds_ops = call_ops;
1720 dprintk("%s: Reading ino:%lu %u@%llu\n",
1721 __func__, inode->i_ino, rdata->args.count, rdata->args.offset);
1723 trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
1724 if (trypnfs != PNFS_NOT_ATTEMPTED)
1725 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
1726 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1731 pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head)
1733 struct nfs_read_data *data;
1734 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1735 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1737 desc->pg_lseg = NULL;
1738 while (!list_empty(head)) {
1739 enum pnfs_try_status trypnfs;
1741 data = list_first_entry(head, struct nfs_read_data, list);
1742 list_del_init(&data->list);
1744 trypnfs = pnfs_try_to_read_data(data, call_ops, lseg);
1745 if (trypnfs == PNFS_NOT_ATTEMPTED)
1746 pnfs_read_through_mds(desc, data);
1748 pnfs_put_lseg(lseg);
1751 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
1753 pnfs_put_lseg(hdr->lseg);
1754 nfs_readhdr_free(hdr);
1756 EXPORT_SYMBOL_GPL(pnfs_readhdr_free);
1759 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
1761 struct nfs_read_header *rhdr;
1762 struct nfs_pgio_header *hdr;
1765 rhdr = nfs_readhdr_alloc();
1767 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1769 pnfs_put_lseg(desc->pg_lseg);
1770 desc->pg_lseg = NULL;
1773 hdr = &rhdr->header;
1774 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
1775 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
1776 atomic_inc(&hdr->refcnt);
1777 ret = nfs_generic_pagein(desc, hdr);
1779 pnfs_put_lseg(desc->pg_lseg);
1780 desc->pg_lseg = NULL;
1782 pnfs_do_multiple_reads(desc, &hdr->rpc_list);
1783 if (atomic_dec_and_test(&hdr->refcnt))
1784 hdr->completion_ops->completion(hdr);
1787 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
1790 * There can be multiple RW segments.
1792 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
1794 struct pnfs_layout_segment *lseg;
1796 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
1797 if (lseg->pls_range.iomode == IOMODE_RW &&
1798 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1799 list_add(&lseg->pls_lc_list, listp);
1803 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
1805 struct pnfs_layout_segment *lseg, *tmp;
1806 unsigned long *bitlock = &NFS_I(inode)->flags;
1808 /* Matched by references in pnfs_set_layoutcommit */
1809 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
1810 list_del_init(&lseg->pls_lc_list);
1811 pnfs_put_lseg(lseg);
1814 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
1815 smp_mb__after_clear_bit();
1816 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
1819 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
1821 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
1823 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
1826 pnfs_set_layoutcommit(struct nfs_write_data *wdata)
1828 struct nfs_pgio_header *hdr = wdata->header;
1829 struct inode *inode = hdr->inode;
1830 struct nfs_inode *nfsi = NFS_I(inode);
1831 loff_t end_pos = wdata->mds_offset + wdata->res.count;
1832 bool mark_as_dirty = false;
1834 spin_lock(&inode->i_lock);
1835 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1836 mark_as_dirty = true;
1837 dprintk("%s: Set layoutcommit for inode %lu ",
1838 __func__, inode->i_ino);
1840 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &hdr->lseg->pls_flags)) {
1841 /* references matched in nfs4_layoutcommit_release */
1842 pnfs_get_lseg(hdr->lseg);
1844 if (end_pos > nfsi->layout->plh_lwb)
1845 nfsi->layout->plh_lwb = end_pos;
1846 spin_unlock(&inode->i_lock);
1847 dprintk("%s: lseg %p end_pos %llu\n",
1848 __func__, hdr->lseg, nfsi->layout->plh_lwb);
1850 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1851 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1853 mark_inode_dirty_sync(inode);
1855 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
1857 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
1859 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
1861 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
1862 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
1863 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
1867 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1868 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1869 * data to disk to allow the server to recover the data if it crashes.
1870 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1871 * is off, and a COMMIT is sent to a data server, or
1872 * if WRITEs to a data server return NFS_DATA_SYNC.
1875 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
1877 struct nfs4_layoutcommit_data *data;
1878 struct nfs_inode *nfsi = NFS_I(inode);
1882 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
1884 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1887 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1888 data = kzalloc(sizeof(*data), GFP_NOFS);
1894 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1897 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
1902 status = wait_on_bit_lock(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING,
1903 nfs_wait_bit_killable, TASK_KILLABLE);
1908 INIT_LIST_HEAD(&data->lseg_list);
1909 spin_lock(&inode->i_lock);
1910 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1911 clear_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags);
1912 spin_unlock(&inode->i_lock);
1913 wake_up_bit(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING);
1917 pnfs_list_write_lseg(inode, &data->lseg_list);
1919 end_pos = nfsi->layout->plh_lwb;
1920 nfsi->layout->plh_lwb = 0;
1922 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
1923 spin_unlock(&inode->i_lock);
1925 data->args.inode = inode;
1926 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
1927 nfs_fattr_init(&data->fattr);
1928 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
1929 data->res.fattr = &data->fattr;
1930 data->args.lastbytewritten = end_pos - 1;
1931 data->res.server = NFS_SERVER(inode);
1933 status = nfs4_proc_layoutcommit(data, sync);
1936 mark_inode_dirty_sync(inode);
1937 dprintk("<-- %s status %d\n", __func__, status);
1944 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
1946 struct nfs4_threshold *thp;
1948 thp = kzalloc(sizeof(*thp), GFP_NOFS);
1950 dprintk("%s mdsthreshold allocation failed\n", __func__);